package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class RefreshTokenInterceptor implements HandlerInterceptor {


    private StringRedisTemplate stringRedisTemplate;

    // 使用构造函数注入
    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 1 、获取请求头中的 token
        String token = request.getHeader("authorization");
        // 判断是否为空
        if (StrUtil.isBlank(token)){
            return true;
        }
        // 2、基于token 获取redis中的用户
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(RedisConstants.LOGIN_USER_KEY + token);
        // 3、判断用户是否存在
        if(userMap.isEmpty()){
            return true;
        }



        // 5、 将查询 到的hash数据转为 userdto对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);


        // 6、存在保存用户信息到 threadlocal
        UserHolder.saveUser(userDTO);
 
        // 7、 刷新token 有效期
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY + token,3000L, TimeUnit.MINUTES);
        // 8、放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 移除用户 避免内存泄露
        UserHolder.removeUser();
    }
}
